National Standard of Tungsten Wires: GB/T 4181—2017

Overview of Standard: Tungsten Wires GB/T 4181—2017
Standard No.: GB/T 4181—2017
Standard Name: Tungsten Wires
Implementation Date: 2018-02-01
Release Date: 2017-07-31

GB/T 4181—2017 Tungsten Wires is a recommended national standard of China. It specifies the grades, types, conditions, recommended applications, product designation, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation, and storage of tungsten wires. This standard applies to the production and inspection of black tungsten wire and cleaned tungsten wire used in electric light sources and electronic devices, including filaments, hot wires, grids, springs, supports, leads, heating elements, and high-temperature components.

1.Scope of Application
This standard applies to the production, inspection, and delivery inspection of tungsten wires. It defines the technical requirements that must be met during manufacturing, inspection, and delivery to ensure consistent performance and reliable quality across different applications.

2.Normative References
The standard references relevant national and industry standards as the basis for inspection and testing, covering chemical composition analysis, dimensional measurement, mechanical property testing, and sampling procedures. These documents provide a unified technical basis for evaluating tungsten wire quality.

3.Product Classification and Conditions

3.1 Classification by Grades and Types
Tungsten wires are classified into different grades based on chemical composition, such as WK80, WK60, WK40, and W1, with corresponding types and conditions defined for each grade.

3.2 Product Conditions
Tungsten wire is classified by processing condition into annealed, as-drawn (work-hardened), and stress-relieved states, to meet different processing and application requirements.

4.Technical Requirements

4.1 Chemical Composition Requirements
Tungsten wire shall be primarily composed of high-purity tungsten, with strict control over impurity elements. The standard specifies limits for impurities such as Si, Al, and K to ensure stable material performance.

4.2 Dimensional Tolerances
Specifications such as diameter and length must meet the allowable tolerances defined in the standard to ensure proper processing and assembly compatibility. Some specifications require stricter diameter tolerances.

4.3 Appearance and Performance Requirements
The surface of tungsten wire shall be continuous and uniform, free from visible cracks and folds, and shall not affect usability. The standard also specifies requirements for tensile strength, straightness, and other performance indicators.

5.Test Methods and Inspection Rules
The standard defines test methods for chemical composition analysis, dimensional measurement, appearance inspection, and mechanical property testing. It also specifies sampling procedures, acceptance criteria, and retesting rules.

6.Marking, Packaging, Transportation, and Storage

6.1 Marking Requirements
Each delivered product shall include identification information such as standard number, specification, grade, and batch number for traceability and management.

6.2 Packaging Requirements
Tungsten wires shall be packaged in a manner that prevents moisture, contamination, and mechanical damage, ensuring product quality during transportation and storage.

6.3 Transportation and Storage
During transportation, exposure to moisture and impact should be avoided. Storage shall be in a dry and well-ventilated environment to prevent contamination and deterioration.

7.Quality Certificate and Order Requirements
Each batch of tungsten wire shall be accompanied by a quality certificate, including supplier name, product name, specification, grade, batch number, applicable standard number, and inspection results. The purchase order shall clearly specify product specifications, conditions, dimensional tolerances, quantity, packaging, and applicable standards to ensure consistent delivery.

For any inquiry, please contact tungsten wire manufacturer: CTIA GROUP

Email: sales@chinatungsten.com

Tel: 0086 592 5129696 / 0086 592 5129595

Website: www.tungsten.com.cn

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